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Voltage profile regulation in Low-Voltage distribution systems
Koštialik, Marek ; Kopička, Marek (referee) ; Drápela, Jiří (advisor)
This paper deals with controlling the voltage profile in low voltage distribution networks. In the first part of the theoretical analysis is the solution view of inadequate elimination connecting renewable energy sources on distribution network. Subsequently, in a published review of factors representing the power quality in LV. The second part is a detailed search of the individual voltage regulators in consideration their specific solvability in LV. In the practical part will followed by the selection and realization of serial voltage regulator and consequently it´s experimental verification functions in low-voltage network.
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Autonomous and dispatching control of distributed power generating plants operated in the HV distribution system
Dvořáček, Jiří ; Jurík, Michal (referee) ; Drápela, Jiří (advisor)
Theses focuses on the evaluation of the possible means of active and reactive power control of generating units connected to medium voltage. First part summarizes analysis of Czech Republic medium voltage distribution grid. It summarizes means of autonomous and dispatcher control of generating units with respect to European Comission directive RfG, standard ČSN EN 50549-2 and national implementation PPDS. Following parts provide description of generating unit and distribution grid models used for simulation in PSCAD. Last part focuses on evaluation of results obtained via simulating steady-state scenarios as well as continuous simulation.
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Measurement and analysis of audio-frequency differential disturbances in distribution systems
Doseděl, Tomáš ; Havránek, Zdeněk (referee) ; Drápela, Jiří (advisor)
This thesis deals with voltage disturbances in audio-frequency propagated in distribution networks. In the theoretical part, a creation and effect of these interferences are discussed as well as current methods of their measurement. In the practical part of the thesis, a measurement device based on a frequency filter was developed. This measurement device is able to measure audio-frequency disturbances up to 250kHz without suppresion of audio-frequency disturbances. The maximum frequency on the output is limited by either 125kHz or 250 kHz filter.
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Containerized Low-Voltage/ Middle-Voltage Substations
Marcol, Michal ; Loutocký, Evžen (referee) ; Drápela, Jiří (advisor)
As it is already apparent from a title of my work, I will be engaged in proposal of container VN/NN distributor using components from company ABB. This work will be after final making also used by company ABB to simplify procedure of proposal of any kind of container distributor. In my labor I will be generally deal with individual products, which will after that be used in distributor. Next I will be engaged in particular making of distributor, which should be made. The distributor will be designed for a separate part of the transformer and for a transformer as a unit, which is not separated from substation.
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LED based signal lights and luminaires for traffic applications
Mikula, Vladimír ; Baxant, Petr (referee) ; Drápela, Jiří (advisor)
Chief topic of a Master’s Thesis is comparing of conventional sources of light with LED diodes, their characteristics. This work deals with utilizing LED diodes in automotive lighting, in railway applications and universal information about principle of lighting. Else this work describes feasibility study of headlight of railway locomotive. Emphasis is laying for clearness of this work.
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Power factor correction and low-frequency conducted disturbances assessment of an industrial induction heating system
Vývoda, Marek ; Žila, Drahoslav (referee) ; Drápela, Jiří (advisor)
This Diploma thesis deals with design of for power factor correction device for mid-frequency-range induction heating and also with assessment of correction device influence in harmonically distorted environment from the distribution net point of view. Research chapters contain of main characteristics of electrical power quality and theoretical background of reactive power, which is in our case caused by driven non-linear elements. Further, the heating power supply block is explained and simulations of power consumption in Matlab - Simulink is done, within the prove of corrective tools design. After the build of corrective tool assemblies, measurements are matched with the simulation results.
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Modeling and simulation of a hybrid micro grid in PSCAD environment
Moravčík, Martin ; Mastný, Petr (referee) ; Drápela, Jiří (advisor)
In the opening part of this master´s thesis there is given concept, description, usage and advantages of micro hybrid grids in comparison to micro grids and there are evolution steps towards hybrid grid. There is also a mention about economics of operation of these grids. In the second part of this thesis there are descriptions of devices that are suitable for usage in micro hybrid grids with emphasis on generators and accumulation possibilities. In the next part of this thesis there is given an approach and description for modeling of various components of hybrid grids in PSCAD environment. In the next part of this thesis there are given simulation results that were conducted on created model. Especially power balance in 24 hour operation of the grid with method for determining suitable size of accumulation and installed capacity of photovoltaics. And next there are showed responses from change of power from photovoltaics, next there is a transition to islanded mode and last there is showed the behavior of converter when the limits of accumulation are reached. In the final part of this thesis there are conclusions, fulfillment of goals of this thesis and possibilities of further study.
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Passive shunt filtration and compensation
Urant, Tomáš ; Novotný, Jan (referee) ; Drápela, Jiří (advisor)
The aim of this work is to acquaint the reader with the theoretical and practical design filtration-compensation device. The theoretical part describes the problems of reactive power compensation and harmonic filtering components. There are described various methods and implementation of compensation and filtration-compensation devices. In the practical part is the theoretical basis used for the realization of a laboratory model of filtration-compensation device for precisely specified load with precisely specified requirements. In laboratory model can be seen meaning of filtering harmonics by using of simple hand switching individual filters.
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Testing of Merging Unit comprising voltage and current transducers in the set
Ziegler, Jiří ; Drápela, Jiří (referee) ; Topolánek, David (advisor)
The diploma thesis is focused on testing and design of a test system of merging unit which provides digital output according to IEC 61850-9-2. The parameters and distinguishing features of the test system are based on functional principles of merging unit and standards dealing with the testing of transducers. The proposed test system is based on modular PXI Express system from National Instruments. The desing is performed with respect to the possibility of generating test signals and measurements for voltage up to 38.4 kV and current up to 2000 A. The proposed test system meets the criteria for testing transducers of accuracy class up to 0.5. Assuming of calibration designed test system as a whole, this test setup has the potential to meet the technical requirements for testing transducers of accuracy class up to 0.1.
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Electrical safety monitoring systems - Insulation monitors
Kurka, Robin ; Bátora, Branislav (referee) ; Drápela, Jiří (advisor)
This thesis deals with solving the problem of insulation monitoring devices (IMD). The aim is to monitor the isolation status in the healthcare system, thus in an isolated power supply (IT) called the medical IT system. A summary of the used means and the used solutions of the way of supply from the point of view of reliability and safety were made to solve the problematics of the medical IT system.The thesis is based on an analysis of the experience of the use of IMD in medical IT system and also provides instructions for using IMD depending on the extent of their functions. The result of this thesis is a design of the electric power switchboard medical IT system with insulation monitoring device. A partial result of this thesis is the technical layout of the components inside the switchboard cabinet and their setting by means of a communication bus.
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